Locomotive-boiler.



N0. 79l,239. PATENTED MAY 30, 1905.

E. BLASS, LOGOMOTIVB BOILER. APPLIGATION FILED 21m, 1902.

=2 SHEETS-SHEET l.

No. 791,239. PAT'ENTED MAY 30,1905. B. BLASS.

. LOCOMOTIVE BOILER.

APPLIOATION FILED FEB. 5, 1902.

2 SHEETS-SHEET 2.

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UNITED STATES .tatented May 30, 1905.

EDUARD BLASS, OF ESSEN-ON-THE-RUHR, GERMANY.

LOCOMOTIVE-rBOILER.

SPECIFICATION forming part of Letters Patent No. 791,239, dated May 30,1905.

Application filed February 5, 1902. Serial No. 92,604.

To aZZ whom it may concern:

Be it known that I, EDUARD BLAss, a subject of the Kingof Prussia,German Emperor, residing at No. 80 Bahnhofstrasse, Essen-on-the- Ruhr,Kingdom of Prussia, German Empire, have invented new and usefulImprovements in Locomotive-Boilers, of which the following is aspecification.

This invention relates to improvements in locomotive-boilers withcylindrical fire-boxes, and has for its object to obviate a leakage ofthe boiler-,or more especially of the seams of the same. In a boiler ofthis description with cylindrical fire-box and cylindrical jacket orshell the shell does not come in contact with the fire-gases when theboiler is heated. The lower part of the boiler remains, in consequence,thereof cooler than the upper portion of same, with the result that theupper part of the shell expands more than the lower part. The boiler bysuch unequal expansion assumes a bent shape or deformation, whereby theriveted joints in the boiler jacket or shell commence to leak. As soonas the engine is started and the water set in motion the differences intemperature are soon equalized, the

boiler again becomes straight, and the rivetseams cease to leak,providing a permanent deformation at the joint has not set in. Although,as hereinbefore indicated, the boiler recovers or becomes tight againthe first few times after the described leakage, the deformation will,however, in the course of time become permanent and the rivets aroundthe jacket will continually be found to leak. This objection or drawbackis obviated by the pres ent invention in such manner that close to thecylindrical rivet-seam a number of annular or spiral shaped corrugationsare arranged either across the entire periphery of the boiler or onlyacross apart of same, the said corrugations offering a resilientresistance to the bending strains, and thus prevent to a greater or lessextent the formation of flexion stresses in the circumferential seamsand the consequent risk, as hereinbefore described, of a leakagefrom theseams.

The invention is illustrated panying drawings, in which- Figures 1 to 3represent longitudinal sections of a boiler, showing differentconstructional methods of carrying my invention into effect, while Fig.4 is a side elevation of a modified form of 1 construction in which thecorrugations extend only across a part of the circumference of theshell.

As shown in the drawings, a represents the seam of the shell of theboiler, and b the corrugations, which according to the present inventionare arranged close to the seams of the cylindrical boilershell. ,What Iclaim, and desire to secure by Letters Patent of the United States, is

in the accom- 1. In a locomotive-boiler with cylindrical fire-box andsmooth cylindrical shell, the arrangement of corrugations between thesmooth chutes of the shell or jacket close to the seams of the same, asand for the purpose set forth.

2. In a locomotive-boiler with riveted circumferential corrugations inthe plates of such shell intermediate its seam edges, as and for thepurpose set forth.

In testimony whereof I have hereunto set my hand in presence of twosubscribing witnesses.

EDUARD BLASS. Witnesses: 7

PETER LIEBER, WILLIAM EssENWEIN.

